Problem with my own libraries and check forms. Codeigniter - php

Question

I have a problem, everything was working but then I tried to put my functions in my own libraries (to use them in different controllers) and it doesn't work.
I have SIGNUP controller with this:
$this->load->library('Check_functions');
// We check the form
$return_verif_form_signup = $this->check_functions->verif_form_signup($language);
which calls my librarie Check_functions:
class Check_functions {
public function verif_form_signup($language) {
if ($this->input->post()){
// Verification rules
$this->form_validation->set_rules('name', 'lang:name', 'trim|required|xss_clean');
....
if ($this->form_validation->run($this)) {
extract($_POST);
...
...
}
But I get the error:
Fatal error: Call to a member function post() on a non-object
Does anyone know how I could fix it?
thanks!
EDIT:
I have found the problem, the callback function is not called. If I replace callback_free_email by REQUIRED and I don't enter an email, my form is not submitted, so it's okay.
But if I have the following code, my form is always submitted. So the callback function is never called...
This is my code (i'm using HMVC):
class Check_functions {
private $CI;
public function __construct(){
$this->CI =& get_instance();
}
public function verif_form_signup($language) {
if ($this->CI->input->post()){
$this->CI->form_validation->set_rules('name', 'lang:field_name', 'trim|required|min_length[3]|max_length[25]|xss_clean');
$this->CI->form_validation->set_rules('email_signup', 'lang:field_email', 'callback_free_email');
...//other rules
if ($this->CI->form_validation->run($this->CI)) {
.....
}
}
}
public function free_email($str) {
return FALSE; // I have temporarly set that so I see if my function is called
}
}
I have a file called MY_Form_validation.php as suggested here: http://codeigniter.com/forums/viewthread/143057/#769347
class MY_Form_validation extends CI_Form_validation{
function run($module = '', $group = ''){
(is_object($module)) AND $this->CI = &$module;
return parent::run($group);
}
}
I really don't know what's wrong... why my callback function is not called?
Thank you for your help!

Answer 1

when you are writing libraries, you have to manually grab the Codeigniter instance like this
$CI =& get_instance();
then you would use $CI where you would normally use $this to interact with loaded codeigniter resources
so...
instead of
$this->input->post();
you would write
$CI->input->post();
Docs explain it here http://codeigniter.com/user_guide/general/creating_libraries.html
EXAMPLE LIBRARY STRUCTURE
class Examplelib {
// declare your CI instance class-wide private
private $CI;
public function __construct()
{
// get the CI instance and store it class wide
$this->CI =& get_instance();
}
public function lib_function()
{
// use it here
$this->CI->db->etc()
}
public function another_func()
{
// and here
$this->CI->input->post();
}
}

Answer 2

I finally found a workaround, instead of using the callback in my rule, I do a test later and call a verification function.
It’s works well like that.
Thanks for your help!